US Customs Duty & Section 301 Tariff Calculator
Estimate landed customs costs including FOB dutiable value, base MFN tariffs, Section 301 China surcharges, and statutory MPF/HMF port fees.
Commercial Cargo & Tariff Parameters
Assessed in addition to standard MFN tariff rate on goods of Chinese origin.
Apply sector-specific or provisional trade remedies assessed against your HTSUS classification.
Tariff authorities remain active and fluid. Beyond Column 1 MFN and Section 301, products may face Section 232 sectoral tariffs, Section 122 surcharges, or AD/CVD penalties. Consult your licensed customs broker or CBP ACE entry summary for binding classifications.
Based on declared customs FOB value of $25,000.00, your cargo incurs $875.00 base MFN tariff, $6,250.00 Section 301 China tariff, $86.60 MPF user fee, $31.25 HMF ocean fee, and $150.00 electronic entry filing.
Itemized CBP Landed Assessment & Statutory Fees
Official tariff line-item breakdown under US Customs Title 19 regulations
| CBP Fee / Tariff Component | Calculation Basis | Assessed Amount (USD) |
|---|---|---|
| Standard Ad Valorem Tariff (MFN) HTSUS Col. 1 | $25,000.00 FOB × 3.50% Base Rate | $875.00 |
| Section 301 China Tariff Surcharge Punitive | $25,000.00 FOB × 25.00% Surcharge Rate | $6,250.00 |
| Merchandise Processing Fee (MPF) 19 U.S.C. 58c | 0.3464% Ad Valorem (Min $31.67 / Max $614.35) | $86.60 |
| Harbor Maintenance Fee (HMF) 26 U.S.C. 4461 | 0.125% Ad Valorem (Ocean Freight Arrivals Only) | $31.25 |
| Estimated Customs Brokerage Entry Service Fee | Standard electronic commercial entry filing baseline | $150.00 |
| Total Landed Customs Clearance Cost | Combined CBP Duties + Statutory User Fees + Brokerage | $7,392.85 |
Recommended Next Steps in Your Import Clearance Workflow
Connect this customs tariff estimate to supplier contract terms or air freight volumetric auditing.
How It Works in Plain English
Importers often calculate their profit margins using only the factory invoice price and ocean freight. When the cargo arrives at a US port, US Customs and Border Protection (CBP) hits them with standard Most Favored Nation (MFN) duties, punitive Section 301 tariffs (frequently an extra 7.5% to 25%), and statutory federal user fees like the Merchandise Processing Fee (MPF) and Harbor Maintenance Fee (HMF). If an importer misses these, a profitable product can easily trigger an unexpected loss.
The user enters their commercial invoice value (FOB value), standard base duty rate, selects the country of origin (which flags Section 301 or trade remedies), and chooses the shipping mode (Ocean vs. Air/Truck). The tool automatically computes statutory fees—applying the federal minimum and maximum caps on MPF—and displays the complete landed duty bill per shipment and per individual unit.
"It’s like an automated tax software for sea containers that catches hidden port fees, Trump-era China trade tariffs, and federal clearance surcharges before your cargo docks."
How US Customs Calculates Import Duties and Taxes
Unlike the European Union, the United Kingdom, and Australia—which compute tariffs using Cost, Insurance, and Freight (CIF) valuation—the United States Customs and Border Protection (CBP) evaluates customs duties strictly using the Free on Board (FOB) Transaction Value method under 19 U.S.C. 1401a. International ocean or air freight charges and marine transit insurance premiums are non-dutiable and must be deducted from the commercial invoice if bundled together.
Every imported commodity is categorized under a 10-digit classification within the Harmonized Tariff Schedule of the United States (HTSUS). The first 6 digits represent the global standard established by the World Customs Organization (WCO), while digits 7 through 10 provide US-specific statistical monitoring and tariff duty rate determinations.
Customs Dutiable Value = Total Units × Unit FOB Export Price (USD)
Total CBP Assessment = Base MFN Tariff + Section 301 Surcharge + MPF + HMF
Under 19 U.S.C. 1321 (widely known as Section 321 de minimis), commercial shipments valued at $800.00 USD or less imported by one individual or business on a single calendar day enter the United States entirely duty-free and exempt from statutory entry processing fees.
The Section 301 China Tariff Landscape
Enacted under Section 301 of the Trade Act of 1974, additional punitive tariffs apply to billions of dollars of imports originating from the People's Republic of China. These tariffs are assessed in addition to standard Most-Favored-Nation (MFN) General Column 1 rates:
Lists 1, 2, and 3 (25.0% Additional Surcharge)
Covers industrial equipment, electronics, plastics, automotive components, furniture, and luggage under HTS subheadings classified across 2018–2019 actions.
List 4A (7.5% Additional Surcharge)
Encompasses consumer apparel, footwear, textiles, and select consumer tech accessories adjusted under the US-China Phase One Economic Agreement.
Attempting to evade Section 301 tariffs by transshipping Chinese goods through intermediate countries like Vietnam, Malaysia, or Mexico without meeting strict "substantial transformation" legal standards constitutes illegal transshipment and customs fraud under the Enforce and Protect Act (EAPA).
Understanding US Customs Statutory User Fees: MPF and HMF
In addition to ad valorem customs tariffs, CBP mandates two statutory user fees on commercial cargo entries:
- Merchandise Processing Fee (MPF): Authorized by 19 U.S.C. 58c, MPF offsets CBP administrative examination costs. For formal commercial entries (cargo values exceeding $2,500.00), MPF is assessed at 0.3464% of FOB value, subject to statutory limits:
MPF Clamp Range: Minimum $31.67 Floor ⟷ Maximum $614.35 Ceiling
- Harbor Maintenance Fee (HMF): Created under the Water Resources Development Act of 1986, HMF assesses 0.125% of the cargo value strictly on commercial ocean shipments arriving at US coastal and inland ports. Air cargo, express courier parcels, and border truck crossings are 100% exempt from HMF.
Frequently Asked Questions
Are US customs duties calculated on the shipping cost? ▼
No. Unlike the European Union (which uses CIF valuation and taxes international shipping and insurance), the United States utilizes FOB transaction valuation. Duties are calculated exclusively on the commercial value of the cargo at the foreign export port.
What is the maximum Merchandise Processing Fee (MPF) for US imports? ▼
For formal commercial entries, the MPF is assessed at 0.3464% of the FOB cargo value, subject to a statutory minimum floor of $31.67 and a statutory maximum ceiling of $614.35.
Does air freight incur the Harbor Maintenance Fee (HMF)? ▼
No. The 0.125% Harbor Maintenance Fee applies exclusively to commercial ocean freight discharged at designated US maritime ports. Air freight, rail cargo, and road crossings are completely exempt from HMF.
What is the difference between informal and formal customs entry? ▼
Informal entries cover commercial shipments valued between $800.01 and $2,500.00. They do not require a customs surety bond and incur a flat $2.00 MPF fee. Formal commercial entries apply to shipments valued over $2,500.00, requiring a customs bond, electronic filing, and ad valorem MPF assessment.
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